strncasecmp.c

/* Copyright (C) 1992, 1996 Free Software Foundation, Inc.This file is part of the GNU C Library.The GNU C Library is free software; you can redistribute it and/ormodify it under the terms of the GNU Library General Public License aspublished by the Free Software Foundation; either version 2 of theLicense, or (at your option) any later version.The GNU C Library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNULibrary General Public License for more details.You should have received a copy of the GNU Library General PublicLicense along with the GNU C Library; see the file COPYING.LIB. Ifnot, write to the Free Software Foundation, Inc., 675 Mass Ave,Cambridge, MA 02139, USA. */#include <ansidecl.h>#include <string.h>#include <ctype.h>/* Compare no more than N characters of S1 and S2, ignoring case, returning less than, equal to or greater than zero if S1 is lexicographically less than, equal to or greater than S2. */int
strncasecmp (constchar *s1, constchar *s2, size_t n)
{
registerconstunsignedchar *p1 = (constunsignedchar *) s1;
registerconstunsignedchar *p2 = (constunsignedchar *) s2;
unsignedchar c1, c2;
if (p1 == p2 || n == 0)
return 0;
do
{
c1 = tolower (*p1++);
c2 = tolower (*p2++);
if (c1 == '\0' || c1 != c2)
return c1 - c2;
} while (--n > 0);
return c1 - c2;
}